Malicious PDF — malware analysis report

Static analysis result for SHA-256 d047dcf2b78b2f3a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 11:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a85b68e5d48212ea9fe4902683d31315 SHA-1: cf9d0d197dd76b786b9935bf1ea64d32b826cc80 SHA-256: d047dcf2b78b2f3a5edfd5638b19cf9fc55bb2df40b03923844702f984ec2585
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or social engineering attack aimed at tricking users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c38e1d15---dirawilimowijivifo.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/127100608fae4ab380f82341914ba0de/25156153237.pdfIn PDF document text
    • http://salkim.com/userfiles/file/1480967376.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/tigabatufepotiw.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b3ea069a0---12212876771.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/dezovim.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9db8522cb85cbc3c6858029e5751c9e6/72022098959.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/36965751782.pdfIn PDF document text
    • http://leguido.net/files/xedivunijixuzabolidapov.pdfIn PDF document text
    • http://remobudostol.pl/pliki/94914607310.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b0d07665---pewulifevetaza.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/19351935357.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/jopuzolosop.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/zajiroganabasaf.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24050315b---3781408169.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210815005550.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c2ec589da74d8e9a6c280dcf09f8f2d4/42042769280.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/f860hi626kvkdvm7a1meclkeer/46819372789.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/lisinenumixurutuzukigaf.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/1u9gimkhl5cvonai36jhnjjf7p/wukosate.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/78fd4dd7dff456de046fb9a2311bfc9e/57421842092.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/57694965078.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pisezilevizomazasatedazi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c99b10fea---fufugidigovoxa.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/7363429846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=monthly+performance+report+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 10732 bytes
SHA-256: ba3e99ebb3f89ae06c08dde5784d2be6c3d8153a7bdde76f5fc38d1cf36f2a9a
font_02_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16796 bytes
SHA-256: 86a6911e11fc261aa56aa02f558f5ae160262b39b19c20bca54b927671159f74

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